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Control apparatus and ignition apparatus

a technology of control apparatus and ignition apparatus, which is applied in the direction of electric control, ignition safety means, machines/engines, etc., can solve the problems of excessive energy input amount, excessive energy input amount from the energy input circuit, engine misfire, etc., and achieve the effect of suppressing the deterioration of fuel efficiency

Active Publication Date: 2017-06-08
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a control apparatus that can detect abnormalities in an ignition apparatus with a simple configuration. This allows for the engine to operate while minimizing fuel efficiency degradation caused by malfunctions in the energy input circuit.

Problems solved by technology

However, when the secondary current during the continued spark discharge indicates an abnormal numeric value due to malfunction of the ignition apparatus or the like, situations such as those below may occur.
That is, when the secondary current during the continued spark discharge is excessively small, an energy input amount from the energy input circuit may become excessively small, thereby possibly leading to engine misfire.
Conversely, when the secondary current during the continued spark discharge is excessively large, the energy input amount may become excessively large with continued use, thereby possibly leading to further malfunctions.

Method used

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  • Control apparatus and ignition apparatus
  • Control apparatus and ignition apparatus

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first embodiment

[0076]A first embodiment of the present invention will be described with reference to FIGS. 1 to 8. A control apparatus according to the first embodiment is shown in FIGS. 1 and 2. A control apparatus 10 is applied to an engine system 1 and is capable of controlling each section configuring the engine system 1.

[0077]The engine system 1 includes an engine 20, an ignition apparatus 11, and the like. The engine 20 serves as an internal combustion engine.

[0078]For example, the engine 20 is a pre-mixed combustion-type, four-cylinder engine that is driven using gasoline as fuel. The engine 20 includes a cylinder 21, an engine head 22, an intake valve 25, an exhaust valve 26, a piston 27, a crank shaft 29, and the like.

[0079]The cylinder 21 is formed into a cylindrical shape. According to the present embodiment, four cylinders 21 are formed in the engine 20. The engine head 22 is provided so as to seal one end of the cylinder 21. An intake port 23 and an exhaust port 24 that communicate wi...

second embodiment

[0227]An ignition apparatus 11 according to a second embodiment of the present invention will be described with reference to FIG. 9 by (A) and (B). The second embodiment differs from the first embodiment in terms of the manner in which the target current value and the second threshold are set, and the like.

[0228]According to the second embodiment, the control unit 81 determines an operating state of the engine 20 based on, for example, the rotation speed of the engine 20, intake pressure, the amount of fuel injected from the fuel injection valve 4, and the air-fuel ratio. The control unit 81 changes the target current value IGa based on the determined operating state. Specifically, for example, when the control unit 81 determines the operating state of the engine 20 to be a state in which the discharge state of the spark plug 40 in the combustion chamber 28 can be easily maintained, the control unit 81 changes the target current value IGa to be a predetermined value or less. Meanwhi...

third embodiment

[0253]A third embodiment of the present embodiment will be described below with reference to FIG. 10 to FIG. 12. The third embodiment discloses a specific example. It goes without saying that the present invention is not limited to the third embodiment.

[0254]An ignition apparatus 101 according to the third embodiment will be described with reference to FIG. 10.

[0255]The ignition apparatus 101 is mounted in a spark-ignition engine for vehicle driving. The ignition apparatus 101 ignites an air-fuel mixture inside a combustion chamber at a predetermined ignition timing. An example of the engine is a direct injection-type engine that uses gasoline as fuel and is capable of performing lean burn (lean burn). The engine includes a rotational flow control means that generates rotational flow of the air-fuel mixture, such as a tumble flow or a swirl flow, inside the cylinder. In an operating state in which a gas flow rate inside the cylinder is high and the occurrence of a blowout of the spa...

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PUM

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Abstract

In a control apparatus, a discharge control unit controls an igniter unit so that a flow of current from a primary coil towards a ground side is blocked, thereby generating a high voltage in a secondary coil, and controls a spark plug so that the spark plug generates electric discharge. An energy input control unit controls an energy input unit so as to input electrical energy to an ignition coil after the start of control of the spark plug by the discharge control unit. A control unit and an abnormality detecting unit detects an abnormality in the igniter unit or the ignition coil based on a first threshold and a first current value that is a value corresponding to a current detected by a current detection circuit at this time, when a first predetermined period elapses after the start of control of the spark plug by the discharge control unit.

Description

TECHNICAL FIELD[0001]The present invention relates to a control apparatus. In particular, the present invention relates to a control apparatus that controls an ignition apparatus of an internal combustion engine. Furthermore, the present invention relates to an ignition apparatus that is used in an internal combustion engine (engine).BACKGROUND ART[0002]Conventionally, a control apparatus that controls an ignition apparatus of an internal combustion engine and controls ignition of an air-fuel mixture in a combustion chamber is known. For example, in a control apparatus described in PTL 1, a discharge time of a spark plug is measured. Operation of an internal combustion engine is controlled based on the measured discharge time.[0003]In addition, as a related technology for reducing load placed on the spark plug, suppressing needless power consumption, and continuing spark discharge, the present applicants have proposed the following energy input circuit (refer to Japanese Patent Appl...

Claims

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Application Information

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IPC IPC(8): F02P11/06F02D41/30F02D37/02F02D41/22F02P9/00F02D9/08
CPCF02P11/06F02P9/002F02D41/3005F02D37/02F02D41/22F02D9/08F02P17/00F02P3/053F02D41/20F02D41/221F02P5/1502F02P9/007F02P15/10F02D41/0002F02D2041/2058F02D2041/227Y02T10/40
Inventor FUJIMOTO, HIDEKAZUTORIYAMA, MAKOTONAKAYAMA, SATORUIMANAKA, YASUOMITERADA, KANECHIYOTAKEDA, SHUNICHIDOI, KAORIWADA, JUNICHIMORITA, HISAHARUNAKAMURA, NAOHISA
Owner DENSO CORP